Referring to FIG. 10A, the lighting device 1002 may include an internal battery power source 1004, which may include a performance characteristic 1008 such as for battery capacity level; a connection to the power grid 1010; and the like. Referring to FIG. 10B, the lighting device 1002 may provide for shifting of a lighting load off the grid 1012 by connecting a lighting device to the grid 1014; causing the lighting device to monitor an internal battery power source for a performance characteristic 1018; causing the lighting device to select between the grid and the internal battery power source based on the performance characteristic 1020; and the like. In embodiments, the lighting device may include a controller for performing the steps of monitoring the internal battery and choosing between the grid and the internal battery, such as where the controller includes a processor. The lighting device may include an LED lighting source, and the LED lighting source may include an LED driver module. The lighting device may include a fluorescent lamp ballast. The lighting device may be an inverter module driving a fluorescent lamp ballast and fluorescent light source. The lighting device may be a lighting fixture. The lighting fixture may include a housing that receives the illumination source. The lighting device may be an adapter that accepts the illumination source plugged into it. The step of selecting may involve switching between the two alternative power sources. The step of selecting may involve sharing power between the two alternative power sources simultaneously, such as where x percent of power is consumed from one of the alternative power sources and y percent of power is consumed from the other alternative power source.
